PDF malware analysis — malicious · 265ec9f7bdcca7d8

MALICIOUS

PDF

11.5 KB

MD5: 9aecc8a53542439917811aae3dccce94 SHA-1: 832a466df6ee98f7f8180f8be35360fdf8c49106 SHA-256: 265ec9f7bdcca7d89d7716138427d3910b7e101f19b78e39c85671b35f052976

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated and acts as a stager. The critical heuristic CVE_2007_5659 indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) within Adobe Reader. The embedded JavaScript is decoded using a hex decoder keyed by callee.toString() before being evaluated, suggesting it's designed to download and execute a further payload. The ClamAV detection further confirms the malicious nature of the file.

Heuristics 6

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-36181 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36181
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `a246c68d5544a5fc390ae92571a910dee0516c54ba546b2460fd1ca6ec360799`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	604 bytes
`annotation_subject_callee_hex_stage_000.js` `129ab8590c2fc407ef2d0917d93433449c44f0122037d2d1e2c1f42a136a726d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5083 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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